CN109412293A - A kind of mixed connection magnetic circuit memory electrical machine - Google Patents
A kind of mixed connection magnetic circuit memory electrical machine Download PDFInfo
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- CN109412293A CN109412293A CN201811187674.1A CN201811187674A CN109412293A CN 109412293 A CN109412293 A CN 109412293A CN 201811187674 A CN201811187674 A CN 201811187674A CN 109412293 A CN109412293 A CN 109412293A
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- permanent magnet
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- linear type
- electrical machine
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention discloses a kind of mixed connection magnetic circuit memory electrical machines, including hybrid permanent magnet rotor, stator, armature winding and shaft, armature winding is arranged on stator, stator is arranged in hybrid permanent magnet rotor exterior, hybrid permanent magnet rotor includes rotor core, first permanent magnet, second permanent magnet, third permanent magnet and triangle magnetic barrier, first permanent magnet is in linear type radial equipartition in rotor core, triangle magnetic is arranged between two the first permanent magnets to hinder, second permanent magnet and third permanent magnet constitute V-arrangement hybrid permanent magnet, V-arrangement hybrid permanent magnet is arranged symmetrically in triangle magnetic barrier two sides, first permanent magnet and the second permanent magnet constitute series circuit.The present invention can solve in conventional internal formula permanent magnetism memory electrical machine, and tandem type adjustable magnetic narrow range and the serious problem of parallel connection type cross-coupling degaussing to improve motor torque density, and can widen the full working scope efficient operation range of motor.
Description
Technical field
The present invention relates to a kind of permanent magnetism memory electrical machines to belong to motor skill more particularly to a kind of mixed connection magnetic circuit memory electrical machine
Art field.
Background technique
Permanent magnet synchronous motor (Permanent Magnet Synchronous Machine, PMSM) is due to using higher magnetic
The traditional rare earth permanent-magnet material (such as neodymium iron boron) of energy product has high power density, high efficiency, overload capacity reliable for operation and strong
Advantage is the important development direction of Subject " Electric Machinery ".Have benefited from the development of rare earth permanent-magnetic material and power electronic technique, PMSM is in
Small-power field largely replaces electro-magnetic motor, and then in each of aerospace, national defence, industrial and agricultural production and daily life
Field has obtained large-scale application.
Inherent characteristic of the common permanent magnet synchronous motor (PMSM) due to common permanent-magnet material (such as neodymium iron boron), gas in motor
Gap magnetic field is held essentially constant, and speed adjustable range is extremely limited when as electric operation, and in such as electric car, aerospace is wide
The straight application for driving occasion of speed regulation is subject to certain restrictions, therefore to realize that the effective of magneto air-gap field is adjusted to the adjustable of target
Magnetic flow permanent magnet motor is always the hot and difficult issue in motor research field.Permanent magnetism memory electrical machine (hereinafter referred to as " memory electrical machine ") is
A kind of Novel magnetic flux controllable type magneto, it uses low-coercivity Al-Ni-Co permanent magnet, passes through stator winding or direct current arteries and veins
It rushes winding generation Circumferential field air-gap field is adjusted to change permanent magnet magnetization intensity, while permanent magnet has magnetic
The characteristics of close level can be remembered.
The memory electrical machine of traditional topological structure is developed by writing pole type motor, and rotor is by Al-Ni-Co permanent magnet, non-magnetic
Property interlayer and rotor core collectively constitute sandwich structure.This special construction can be realized online to permanent magnet progress anti-at any time
It is irreversible again to fill degaussing, while reducing influence of the quadrature axis armature reaction to air-gap field.Existing research has focused largely on exchange and adjusts
On magnetic-type hybrid permanent magnet memory electrical machine, i.e., NdFeB and AlNiCo permanent magnetism is collectively disposed on rotor, stator winding has both power control
System and two kinds of functions of adjustable magnetic.Studies have shown that the torque density of single permanent-magnet type can reach the level of traditional surface-mounted permanent magnet machine,
Therefore it is well suited to this application higher for power demand of electric car；But hybrid permanent magnet memory electrical machine presently, there are
Main problem is: parallel circuits type armature-reaction easily causes AlNiCo permanent magnetism accident degaussing；And tandem type magnetizes, magnetomotive force need to lead to
Two kinds of permanent magnets are crossed, the capacity of full magnetizing current and inverter needed for increasing, and adjustable magnetic range is relatively narrow.
Summary of the invention
In view of the above-mentioned defects in the prior art, the present invention provides a kind of mixed connection magnetic circuit memory electrical machine, single string is solved
Join the problems such as magnetic circuit type memory electrical machine is excessive there are the capacity of adjustable magnetic narrow range and full magnetizing current and inverter, and it is single
The problems such as parallel circuits type memory electrical machine is serious there are demagnetizing in Al-Ni-Co permanent magnet bringing onto load operational process, and torque density is low.
Technical solution of the present invention is as follows: a kind of mixed connection magnetic circuit memory electrical machine, including hybrid permanent magnet rotor, stator, armature around
Group and shaft, the armature winding are arranged on stator, and the stator is arranged in hybrid permanent magnet rotor exterior, the hybrid permanent magnet
Rotor includes rotor core, the first permanent magnet, the second permanent magnet, third permanent magnet and triangle magnetic barrier, the rotor core
It is set to outside the shaft, the triangle magnetic barrier is set to inside rotor core, and triangle magnetic barrier equal part is distributed in described
The circumferential direction of rotor core, the rotor core, which is internally located between adjacent triangle magnetic barrier, sets that there are two V-shaped groove and one
A linear type slot, the linear type slot are arranged radially in rotor core, and first permanent magnet is set to the linear type slot
Interior, the V-shaped groove is set to the two sides of the linear type slot, and the opening of the V-shaped groove is away from the linear type slot and towards institute
State stator setting, the second permanent magnet be set in the V-shaped groove in the closer side channel of stator described in distance, in the V-shaped groove away from
Third permanent magnet is set in a side channel farther away from the stator, and the coercivity of first permanent magnet is greater than third permanent magnet
Coercivity, the coercivity of second permanent magnet are greater than the coercivity of third permanent magnet.
Further, second permanent magnet and third permanent magnet constitute V-arrangement parallel connection hybrid permanent magnet structure, and the V-arrangement is simultaneously
Connection hybrid permanent magnet symmetrical configuration is arranged in triangle magnetic barrier two sides, and first permanent magnet and the second permanent magnet are in string on magnetic circuit
Connection relationship.
Further, the linear type slot is set to the symmetrical shaft position of two neighboring triangle magnetic barrier, is located at described one
The V-shaped groove of font groove two sides is arranged symmetrically using the linear type slot as symmetry axis.
Further, the closer side channel of stator described in distance is parallel to the linear type slot setting, institute in the V-shaped groove
The symmetry axis that the farther away side channel of stator described in distance in V-shaped groove is stated perpendicular to two neighboring linear type slot is arranged.
Further, first permanent magnet and linear type slot are equipped with gap, and it is close that the gap is located at the first permanent magnet
The side of the shaft.
Further, first permanent magnet and the second permanent magnet are magnetized with the circumference tangential direction of rotor core, described
Third permanent magnet is magnetized with the symmetrical axis direction magnetizing direction for being parallel to two neighboring linear type slot.
Further, the magnetizing direction of adjacent first permanent magnet is on the contrary, between adjacent triangle magnetic barrier
The second permanent magnet magnetizing direction it is identical as the magnetizing direction of the first permanent magnet, two between adjacent triangle magnetic barrier
The magnetizing direction of a third permanent magnet is opposite.
Further, the cross section of the triangle magnetic barrier is in isosceles triangle, the apex angle direction of the isosceles triangle
The stator setting.
Further, the triangle magnetic barrier quantity is even number.
Further, first permanent magnet is Nd-Fe-B permanent magnet, and second permanent magnet is Nd-Fe-B permanent magnet, institute
Stating third permanent magnet is Al-Ni-Co permanent magnet.
The advantages of technical solution provided by the present invention, is:
1, the second permanent magnet and third permanent magnet being arranged in V-shaped groove of the present invention constitute parallel circuits, and the second permanent magnet is cut
To magnetizing, the flexible on-line control of air-gap field is realized in the radially two-way magnetization of third permanent magnet；And first in linear type slot is forever
Magnet cutting orientation magnetizing, the first permanent magnet and the second permanent magnet are in series relationship on magnetic circuit, and the first permanent magnet is to third permanent magnet
Play the steady magnetic effect for promoting its operating point；
2, the present invention due to having the two different permanent magnetic circuits of Series FPB and parallel FPB, two magnetic circuits simultaneously on mixed rotor
It can be achieved to have complementary advantages；Series circuit can realize the steady magnetic action of AlNiCo permanent magnetism, and improve motor torque density, parallel circuits
When can guarantee weak magnetic, permanent magnetic field is most of in internal rotor short circuit, promotes online adjustable magnetic range；So that conventional AC adjustable magnetic type
Intrinsic persistent ailment and both sides' advantage and disadvantage existing for series-parallel magnetic circuit type in memory electrical machine are difficult to the problems such as weighing and have obtained effectively
It solves；
3, adjustable magnetic is carried out using short-time pulse electric current, almost without excitation copper loss, and low-coercivity permanent magnetism can fill repeatedly online
Degaussing；
4, driving adjustable magnetic control strategy can still use for reference conventional vector control technology, and controller is simple, it is easy to accomplish；
5, rotor punching is similar with tradition PMSM, and structure is simpler, is easy to manufacture, motor cost is not high.
Detailed description of the invention
Fig. 1 is motor cross-sectional structure figure of the invention
Distribution diagram of magnetic line of force when Fig. 2 is the third permanent magnet normal magnetization of motor of the invention.
Distribution diagram of magnetic line of force when Fig. 3 is the third permanent magnet magnetic reversal of motor of the invention.
Specific embodiment
Below with reference to embodiment, the invention will be further described, it should be understood that these embodiments be merely to illustrate the present invention and
It is not used in and limits the scope of the invention, after the present invention has been read, those skilled in the art are to various equal similar shapes of the invention
The modification of formula is fallen in the application range as defined in the appended claims.
Incorporated by reference to shown in Fig. 1, mixed connection magnetic circuit memory electrical machine involved in the present embodiment, including stator 1, hybrid permanent magnet rotor
2 and non-magnetic shaft 5.Stator 1 is arranged outside hybrid permanent magnet rotor 2, and stator includes stator core tooth 1.1,1.2 and of stator yoke
The armature winding 4 being located in stator core tooth 1.1, the setting of stator core tooth 1.1 stator yoke 1.2 and hybrid permanent magnet rotor 2 it
Between, between adjacent stator core tooth 1.1 formed cavity 1.3, for place the threephase armature being wrapped in stator core tooth 1.1 around
Group 4.There are air gaps 3 between stator 1 and hybrid permanent magnet rotor 2.
Hybrid permanent magnet rotor 2 includes rotor core 2.1, the first permanent magnet 2.3, the second permanent magnet 2.2, third permanent magnet
2.4 and triangle magnetic barrier 2.5, rotor core 2.1 is set to outside non-magnetic shaft 5.Triangle magnetic barrier 2.5 is set to rotor
Inside iron core 2.1, cross section is in isosceles triangle, and the apex angle of isosceles triangle is arranged towards stator.Triangle magnetic barrier 2.5
Total quantity is even number, and the present embodiment is four, and equal part is distributed in the circumferential direction of rotor core 2.1.Position in rotor core 2.1
V-shaped groove 2.6 and a linear type slot 2.7, linear type slot 2.7 are set to there are two setting between adjacent triangle magnetic barrier 2.5
The symmetrical shaft position of two neighboring triangle magnetic barrier 2.5, the V-shaped groove 2.6 positioned at 2.7 two sides of linear type slot is with linear type slot 2.7
It is arranged symmetrically for symmetry axis, generally hybrid permanent magnet rotor 2 is center symmetric form.
First permanent magnet 2.3 and the second permanent magnet 2.2 are Nd-Fe-B permanent magnet, and third permanent magnet 2.4 is Al-Ni-Co permanent magnet
Body.Linear type slot 2.7 is arranged radially in rotor core 2.1, and the first permanent magnet 2.3 is set in linear type slot 2.7.First forever
Magnet 2.3 and linear type slot 2.7 are equipped with gap, and gap is located at the first permanent magnet 2.3 close to the side of non-magnetic shaft 5.V-shaped groove
2.6 are set to the two sides of linear type slot 2.7, are parallel to linear type slot 2.7 apart from the closer side channel of stator 1 in V-shaped groove 2.6 and set
It sets, the symmetry axis in V-shaped groove 2.6 apart from the farther away side channel of stator 1 perpendicular to two neighboring linear type slot 2.7 is arranged.V-shaped groove
2.6 opening is arranged away from linear type slot 2.7 and towards stator.Second permanent magnet 2.2 is arranged in V-shaped groove 2.6 apart from stator 1
In a closer side channel, third permanent magnet 2.4 is arranged in V-shaped groove 2.6 in the farther away side channel of stator 1.Second permanent magnetism
Body 2.2 and third permanent magnet 2.4 constitute V-arrangement parallel connection hybrid permanent magnet structure, and V-arrangement parallel connection hybrid permanent magnet symmetrical configuration is arranged in triangle
Shape magnetic hinders 2.5 two sides, and the first permanent magnet 2.3 and the second permanent magnet 2.2 are in series relationship on magnetic circuit.First permanent magnet, 2.3 He
Second permanent magnet 2.2 is magnetized with the circumference tangential direction of rotor core 2.1, and third permanent magnet 2.4 is to be parallel to two neighboring one
The symmetrical axis direction magnetizing direction of font groove 2.7 magnetizes.The magnetizing direction of the first adjacent permanent magnet 2.3 is on the contrary, adjacent three
The magnetizing direction of the second permanent magnet 2.2 between angular magnetic barrier 2.5 is identical as the magnetizing direction of the first permanent magnet 2.3, adjacent
The magnetizing direction of two third permanent magnets 2.4 between triangle magnetic barrier 2.5 is opposite.
Incorporated by reference to shown in Fig. 2 and Fig. 3, the operation logic of mixed connection magnetic circuit memory electrical machine disclosed by the invention is as follows:
The arctic for the first permanent magnet 2.3 that permanent magnet flux is placed from "-" type first, a part of magnetic flux pass through second
After permanent magnet 2.2, stator core tooth is reached, stator yoke is then passed through, with identical path by air gap by way of rotor core 2.1
Return to the South Pole of the first permanent magnet 2.3；And another part magnetic flux reaches the South Pole of third permanent magnet 2.4, considers third permanent magnet
2.4 direction of magnetization at this time, if as shown in Fig. 2, third permanent magnet 2.4 is radially along the first permanent magnet 2.3 and the second permanent magnet
2.2 flow directions magnetize, and third permanent magnet 2.4, which is in, at this time increases magnetic state, equidirectional stream after three pieces of permanent magnet magnetic flux superpositions
It is dynamic；If as shown in figure 3, third permanent magnet 2.4 is radially filled against flow direction between the first permanent magnet 2.3 and the second permanent magnet 2.2
Magnetic, third permanent magnet 2.4 is in weak magnetic state at this time, most of magnetic flux by with the magnetic flux of the second permanent magnet 2.2 in rotor 2
Portion's short circuit.At the same time, armature winding 4 be passed through with the consistent three-phase alternating current of 2 revolving speed of rotor, rotor 2 formed
Rotating excitation field interaction, to realize energy converting between mechanical.The increased triangle magnetic barrier 2.5 of institute can effectively reduce quadrature axis electricity
Sense, and weaken Nd-Fe-B permanent magnetic simultaneously to the cross-coupling demagnetizing effect of Al-Ni-Co permanent magnet, stablize the operating point of Al-Ni-Co permanent magnet.
Claims (10)
1. a kind of mixed connection magnetic circuit memory electrical machine, including hybrid permanent magnet rotor, stator, armature winding and shaft, the armature winding
It is arranged on stator, the stator is arranged in hybrid permanent magnet rotor exterior, which is characterized in that the hybrid permanent magnet rotor includes turning
Sub- iron core, the first permanent magnet, the second permanent magnet, third permanent magnet and triangle magnetic barrier, the rotor core are set to described
Outside shaft, the triangle magnetic barrier is set to inside rotor core, and triangle magnetic barrier equal part is distributed in the rotor core
Circumferential, the rotor core is internally located between adjacent triangle magnetic barrier and sets there are two V-shaped groove and a linear type slot,
The linear type slot is arranged radially in rotor core, and first permanent magnet is set in the linear type slot, the V-shaped groove
The two sides of the linear type slot are set to, the opening of the V-shaped groove is arranged away from the linear type slot and towards the stator, institute
It states and the second permanent magnet is set in the closer side channel of stator described in distance in V-shaped groove, stator described in distance is farther out in the V-shaped groove
A side channel in third permanent magnet is set, the coercivity of first permanent magnet is greater than the coercivity of third permanent magnet, described the
The coercivity of two permanent magnets is greater than the coercivity of third permanent magnet.
2. mixed connection magnetic circuit memory electrical machine according to claim 1, which is characterized in that second permanent magnet and third permanent magnetism
Body constitutes V-arrangement parallel connection hybrid permanent magnet structure, and the V-arrangement parallel connection hybrid permanent magnet symmetrical configuration is arranged in triangle magnetic barrier two sides, institute
The first permanent magnet and the second permanent magnet are stated on magnetic circuit in series relationship.
3. mixed connection magnetic circuit memory electrical machine according to claim 1, which is characterized in that the linear type slot is set to adjacent two
The symmetrical shaft position of a triangle magnetic barrier, the V-shaped groove positioned at linear type slot two sides is using the linear type slot as symmetry axis pair
Claim arrangement.
4. mixed connection magnetic circuit memory electrical machine according to claim 1, which is characterized in that stator described in distance in the V-shaped groove
A closer side channel is parallel to linear type slot setting, in the V-shaped groove the farther away side channel of stator described in distance perpendicular to
The symmetry axis of two neighboring linear type slot is arranged.
5. mixed connection magnetic circuit memory electrical machine according to claim 1, which is characterized in that first permanent magnet and linear type slot
Equipped with gap, the gap is located at the first permanent magnet close to the side of the shaft.
6. mixed connection magnetic circuit memory electrical machine according to claim 1, which is characterized in that first permanent magnet and the second permanent magnetism
Body is magnetized with the circumference tangential direction of rotor core, and the third permanent magnet is to be parallel to the symmetry axis of two neighboring linear type slot
It magnetizes in direction.
7. mixed connection magnetic circuit memory electrical machine according to claim 6, which is characterized in that adjacent first permanent magnet fills
Magnetic direction is on the contrary, the magnetizing direction of the second permanent magnet between adjacent triangle magnetic barrier and the side of magnetizing of the first permanent magnet
Magnetizing direction to two third permanent magnets between identical, adjacent triangle magnetic barrier is opposite.
8. mixed connection magnetic circuit memory electrical machine according to claim 1, which is characterized in that the cross section of the triangle magnetic barrier is in
The apex angle of isosceles triangle, the isosceles triangle is arranged towards the stator.
9. mixed connection magnetic circuit memory electrical machine according to claim 1, which is characterized in that the triangle magnetic barrier quantity is even number
It is a.
10. mixed connection magnetic circuit memory electrical machine according to claim 1, which is characterized in that first permanent magnet is neodymium iron boron
Permanent magnet, second permanent magnet are Nd-Fe-B permanent magnet, and the third permanent magnet is Al-Ni-Co permanent magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811187674.1A CN109412293B (en) | 2018-10-12 | 2018-10-12 | Series-parallel magnetic circuit memory motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811187674.1A CN109412293B (en) | 2018-10-12 | 2018-10-12 | Series-parallel magnetic circuit memory motor |
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| CN109412293A true CN109412293A (en) | 2019-03-01 |
| CN109412293B CN109412293B (en) | 2020-09-11 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109905000A (en) * | 2019-04-23 | 2019-06-18 | 山东理工大学 | Radial and tangential permanent magnet magnetic pole mixed excitation electric machine method for production of rotor |
| CN109936230A (en) * | 2019-03-28 | 2019-06-25 | 东南大学 | A kind of series circuit type two-layer hybrid permanent magnetism memory electrical machine |
| CN110601399A (en) * | 2019-09-12 | 2019-12-20 | 广东上水能源科技有限公司 | Space permanent magnet motor |
| CN111490614A (en) * | 2020-04-23 | 2020-08-04 | 安徽机电职业技术学院 | Motor rotor structure and permanent magnet auxiliary synchronous reluctance motor |
| CN111769667A (en) * | 2020-06-30 | 2020-10-13 | 东南大学 | Series-parallel magnetic circuit separated magnetic pole type memory motor |
| CN111969742A (en) * | 2020-08-03 | 2020-11-20 | 东南大学 | Series-parallel magnetic pole type hybrid permanent magnet memory motor |
| CN113036963A (en) * | 2021-03-16 | 2021-06-25 | 哈尔滨理工大学 | Rotor magnetic circuit structure of V + U-shaped permanent magnet synchronous motor |
| CN113964981A (en) * | 2021-11-11 | 2022-01-21 | 东南大学 | Self-leakage variable magnetic flux memory motor with hybrid permanent magnet rotor |
| CN114552827A (en) * | 2022-03-09 | 2022-05-27 | 郑州佛光发电设备股份有限公司 | Permanent magnet synchronous motor rotor structure with reverse salient pole characteristic |
| CN115065183A (en) * | 2022-08-19 | 2022-09-16 | 东南大学 | Double-layer open-air-gap asymmetric generator for aviation based on topology optimization method |
| CN115800587A (en) * | 2023-01-29 | 2023-03-14 | 东南大学 | Combined magnetic pole permanent magnet synchronous motor based on nano composite permanent magnet material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109936230A (en) * | 2019-03-28 | 2019-06-25 | 东南大学 | A kind of series circuit type two-layer hybrid permanent magnetism memory electrical machine |
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| CN110601399A (en) * | 2019-09-12 | 2019-12-20 | 广东上水能源科技有限公司 | Space permanent magnet motor |
| CN111490614A (en) * | 2020-04-23 | 2020-08-04 | 安徽机电职业技术学院 | Motor rotor structure and permanent magnet auxiliary synchronous reluctance motor |
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| CN111769667A (en) * | 2020-06-30 | 2020-10-13 | 东南大学 | Series-parallel magnetic circuit separated magnetic pole type memory motor |
| CN111969742A (en) * | 2020-08-03 | 2020-11-20 | 东南大学 | Series-parallel magnetic pole type hybrid permanent magnet memory motor |
| CN113036963A (en) * | 2021-03-16 | 2021-06-25 | 哈尔滨理工大学 | Rotor magnetic circuit structure of V + U-shaped permanent magnet synchronous motor |
| CN113964981A (en) * | 2021-11-11 | 2022-01-21 | 东南大学 | Self-leakage variable magnetic flux memory motor with hybrid permanent magnet rotor |
| CN114552827A (en) * | 2022-03-09 | 2022-05-27 | 郑州佛光发电设备股份有限公司 | Permanent magnet synchronous motor rotor structure with reverse salient pole characteristic |
| CN115065183A (en) * | 2022-08-19 | 2022-09-16 | 东南大学 | Double-layer open-air-gap asymmetric generator for aviation based on topology optimization method |
| CN115065183B (en) * | 2022-08-19 | 2022-11-01 | 东南大学 | Double-layer open-air-gap asymmetric generator for aviation based on topology optimization method |
| CN115800587A (en) * | 2023-01-29 | 2023-03-14 | 东南大学 | Combined magnetic pole permanent magnet synchronous motor based on nano composite permanent magnet material |
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